Cloud computing services eliminate the need for local storage thereby lowering operational and maintenance costs. However, security and privacy concerns regarding the out-sourced data prevail. Especially in enterprise environments, sensitive internal and customer data accumulate, which are usually subject to strong legal regulations. Therefore, all the files and information need to be protected when leaving a company's intranet. In this work, we describe a work in progress and propose a flexible system architecture for integrating various types of cloud storage providers into an employee's desktop computer without giving up data security. The system is centered around a proxy server which will apply encryption and information dispersion to all out-sourced files before they leave the internal network. This architecture turns out to be very versatile and provides high levels of data confidentiality, integrity, and availability.